[messengers] The effects of provincial bicycle helmet legislation on helmet use and bicycle ridership in Canada?

*Whats the deal with this study making waves in Aussieland? Pretty sure i
was almost a bike messenger in Canada up until March last year and i didn't
notice any mandatory helmet laws. Can someone from Canada please offer some
feedback on this article.
http://injuryprevention.bmj.com/content/16/4/219.abstract
"The effects of provincial bicycle helmet legislation on helmet use and
bicycle ridership in Canada *
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*Jessica Dennis, Beth Potter, Tim Ramsay, Ryan Zarychanski*
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*Background*
*Bicycle helmet legislation has been variably implemented in six of 10
Canadian provinces. The objectives of this study were to determine the
association between the comprehensiveness of helmet legislation and both
helmet use and bicycle ridership. *
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*Methods*
*Analysis of helmet use was based on data from the 2005 Canadian Community
Health Survey (CCHS) and included respondents from three Canadian provinces
(Saskatchewan, Ontario, and Nova Scotia). Analysis of bicycle use was based
on data from the 2000–01, 2003, 2005, and 2007 cycles of the CCHS and
included respondents from all provinces. In the time between the 2000–01 and
2007 cycles, two provinces (Prince Edward Island (PEI) and Alberta)
implemented helmet legislation. *
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*Results*
*Helmets were reportedly worn by 73.2% (95% CI 69.3% to 77.0%) of
respondents in Nova Scotia, where legislation applies to all ages, by 40.6%
(95% CI 39.2% to 42.0%) of respondents in Ontario, where legislation applies
to those less than 18 years of age, and by 26.9% (95% CI 23.9% to 29.9%) of
respondents in Saskatchewan, where no legislation exists. Though legislation
applied to youth in both Ontario and Nova Scotia, helmet use was lower among
youth in Ontario than among youth in Nova Scotia (46.7% (95% CI 44.1% to
49.4%) vs 77.5% (95% CI 70.9% to 84.1%)). Following the implementation of
legislation in PEI and Alberta, recreational and commuting bicycle use
remained unchanged among youth and adults. *
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*Conclusions*
*Canadian youth and adults are significantly more likely to wear helmets as
the comprehensiveness of helmet legislation increases. Helmet legislation is
not associated with changes in ridership."*